NumberPicker.java revision b52d9729bfb2ef7ad50d9a5125ebf3a8322429a9
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.widget; 18 19import android.animation.Animator; 20import android.animation.AnimatorListenerAdapter; 21import android.animation.AnimatorSet; 22import android.animation.ObjectAnimator; 23import android.annotation.Widget; 24import android.content.Context; 25import android.content.res.ColorStateList; 26import android.content.res.TypedArray; 27import android.graphics.Canvas; 28import android.graphics.Color; 29import android.graphics.Paint; 30import android.graphics.Paint.Align; 31import android.graphics.Rect; 32import android.graphics.drawable.Drawable; 33import android.text.InputFilter; 34import android.text.InputType; 35import android.text.Spanned; 36import android.text.TextUtils; 37import android.text.method.NumberKeyListener; 38import android.util.AttributeSet; 39import android.util.SparseArray; 40import android.util.TypedValue; 41import android.view.KeyEvent; 42import android.view.LayoutInflater; 43import android.view.LayoutInflater.Filter; 44import android.view.MotionEvent; 45import android.view.VelocityTracker; 46import android.view.View; 47import android.view.ViewConfiguration; 48import android.view.accessibility.AccessibilityEvent; 49import android.view.accessibility.AccessibilityManager; 50import android.view.animation.DecelerateInterpolator; 51import android.view.inputmethod.InputMethodManager; 52 53import com.android.internal.R; 54 55/** 56 * A widget that enables the user to select a number form a predefined range. 57 * The widget presents an input filed and up and down buttons for selecting the 58 * current value. Pressing/long pressing the up and down buttons increments and 59 * decrements the current value respectively. Touching the input filed shows a 60 * scroll wheel, tapping on which while shown and not moving allows direct edit 61 * of the current value. Sliding motions up or down hide the buttons and the 62 * input filed, show the scroll wheel, and rotate the latter. Flinging is 63 * also supported. The widget enables mapping from positions to strings such 64 * that instead the position index the corresponding string is displayed. 65 * <p> 66 * For an example of using this widget, see {@link android.widget.TimePicker}. 67 * </p> 68 */ 69@Widget 70public class NumberPicker extends LinearLayout { 71 72 /** 73 * The default update interval during long press. 74 */ 75 private static final long DEFAULT_LONG_PRESS_UPDATE_INTERVAL = 300; 76 77 /** 78 * The index of the middle selector item. 79 */ 80 private static final int SELECTOR_MIDDLE_ITEM_INDEX = 2; 81 82 /** 83 * The coefficient by which to adjust (divide) the max fling velocity. 84 */ 85 private static final int SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT = 8; 86 87 /** 88 * The the duration for adjusting the selector wheel. 89 */ 90 private static final int SELECTOR_ADJUSTMENT_DURATION_MILLIS = 800; 91 92 /** 93 * The duration of scrolling to the next/previous value while changing 94 * the current value by one, i.e. increment or decrement. 95 */ 96 private static final int CHANGE_CURRENT_BY_ONE_SCROLL_DURATION = 300; 97 98 /** 99 * The the delay for showing the input controls after a single tap on the 100 * input text. 101 */ 102 private static final int SHOW_INPUT_CONTROLS_DELAY_MILLIS = ViewConfiguration 103 .getDoubleTapTimeout(); 104 105 /** 106 * The strength of fading in the top and bottom while drawing the selector. 107 */ 108 private static final float TOP_AND_BOTTOM_FADING_EDGE_STRENGTH = 0.9f; 109 110 /** 111 * The default unscaled height of the selection divider. 112 */ 113 private static final int UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT = 2; 114 115 /** 116 * In this state the selector wheel is not shown. 117 */ 118 private static final int SELECTOR_WHEEL_STATE_NONE = 0; 119 120 /** 121 * In this state the selector wheel is small. 122 */ 123 private static final int SELECTOR_WHEEL_STATE_SMALL = 1; 124 125 /** 126 * In this state the selector wheel is large. 127 */ 128 private static final int SELECTOR_WHEEL_STATE_LARGE = 2; 129 130 /** 131 * The alpha of the selector wheel when it is bright. 132 */ 133 private static final int SELECTOR_WHEEL_BRIGHT_ALPHA = 255; 134 135 /** 136 * The alpha of the selector wheel when it is dimmed. 137 */ 138 private static final int SELECTOR_WHEEL_DIM_ALPHA = 60; 139 140 /** 141 * The alpha for the increment/decrement button when it is transparent. 142 */ 143 private static final int BUTTON_ALPHA_TRANSPARENT = 0; 144 145 /** 146 * The alpha for the increment/decrement button when it is opaque. 147 */ 148 private static final int BUTTON_ALPHA_OPAQUE = 1; 149 150 /** 151 * The property for setting the selector paint. 152 */ 153 private static final String PROPERTY_SELECTOR_PAINT_ALPHA = "selectorPaintAlpha"; 154 155 /** 156 * The property for setting the increment/decrement button alpha. 157 */ 158 private static final String PROPERTY_BUTTON_ALPHA = "alpha"; 159 160 /** 161 * The numbers accepted by the input text's {@link Filter} 162 */ 163 private static final char[] DIGIT_CHARACTERS = new char[] { 164 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' 165 }; 166 167 /** 168 * Use a custom NumberPicker formatting callback to use two-digit minutes 169 * strings like "01". Keeping a static formatter etc. is the most efficient 170 * way to do this; it avoids creating temporary objects on every call to 171 * format(). 172 * 173 * @hide 174 */ 175 public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER = new NumberPicker.Formatter() { 176 final StringBuilder mBuilder = new StringBuilder(); 177 178 final java.util.Formatter mFmt = new java.util.Formatter(mBuilder, java.util.Locale.US); 179 180 final Object[] mArgs = new Object[1]; 181 182 public String format(int value) { 183 mArgs[0] = value; 184 mBuilder.delete(0, mBuilder.length()); 185 mFmt.format("%02d", mArgs); 186 return mFmt.toString(); 187 } 188 }; 189 190 /** 191 * The increment button. 192 */ 193 private final ImageButton mIncrementButton; 194 195 /** 196 * The decrement button. 197 */ 198 private final ImageButton mDecrementButton; 199 200 /** 201 * The text for showing the current value. 202 */ 203 private final EditText mInputText; 204 205 /** 206 * The min height of this widget. 207 */ 208 private final int mMinHeight; 209 210 /** 211 * The max height of this widget. 212 */ 213 private final int mMaxHeight; 214 215 /** 216 * The max width of this widget. 217 */ 218 private final int mMinWidth; 219 220 /** 221 * The max width of this widget. 222 */ 223 private int mMaxWidth; 224 225 /** 226 * Flag whether to compute the max width. 227 */ 228 private final boolean mComputeMaxWidth; 229 230 /** 231 * The height of the text. 232 */ 233 private final int mTextSize; 234 235 /** 236 * The height of the gap between text elements if the selector wheel. 237 */ 238 private int mSelectorTextGapHeight; 239 240 /** 241 * The values to be displayed instead the indices. 242 */ 243 private String[] mDisplayedValues; 244 245 /** 246 * Lower value of the range of numbers allowed for the NumberPicker 247 */ 248 private int mMinValue; 249 250 /** 251 * Upper value of the range of numbers allowed for the NumberPicker 252 */ 253 private int mMaxValue; 254 255 /** 256 * Current value of this NumberPicker 257 */ 258 private int mValue; 259 260 /** 261 * Listener to be notified upon current value change. 262 */ 263 private OnValueChangeListener mOnValueChangeListener; 264 265 /** 266 * Listener to be notified upon scroll state change. 267 */ 268 private OnScrollListener mOnScrollListener; 269 270 /** 271 * Formatter for for displaying the current value. 272 */ 273 private Formatter mFormatter; 274 275 /** 276 * The speed for updating the value form long press. 277 */ 278 private long mLongPressUpdateInterval = DEFAULT_LONG_PRESS_UPDATE_INTERVAL; 279 280 /** 281 * Cache for the string representation of selector indices. 282 */ 283 private final SparseArray<String> mSelectorIndexToStringCache = new SparseArray<String>(); 284 285 /** 286 * The selector indices whose value are show by the selector. 287 */ 288 private final int[] mSelectorIndices = new int[] { 289 Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, Integer.MIN_VALUE, 290 Integer.MIN_VALUE 291 }; 292 293 /** 294 * The {@link Paint} for drawing the selector. 295 */ 296 private final Paint mSelectorWheelPaint; 297 298 /** 299 * The height of a selector element (text + gap). 300 */ 301 private int mSelectorElementHeight; 302 303 /** 304 * The initial offset of the scroll selector. 305 */ 306 private int mInitialScrollOffset = Integer.MIN_VALUE; 307 308 /** 309 * The current offset of the scroll selector. 310 */ 311 private int mCurrentScrollOffset; 312 313 /** 314 * The {@link Scroller} responsible for flinging the selector. 315 */ 316 private final Scroller mFlingScroller; 317 318 /** 319 * The {@link Scroller} responsible for adjusting the selector. 320 */ 321 private final Scroller mAdjustScroller; 322 323 /** 324 * The previous Y coordinate while scrolling the selector. 325 */ 326 private int mPreviousScrollerY; 327 328 /** 329 * Handle to the reusable command for setting the input text selection. 330 */ 331 private SetSelectionCommand mSetSelectionCommand; 332 333 /** 334 * Handle to the reusable command for adjusting the scroller. 335 */ 336 private AdjustScrollerCommand mAdjustScrollerCommand; 337 338 /** 339 * Handle to the reusable command for changing the current value from long 340 * press by one. 341 */ 342 private ChangeCurrentByOneFromLongPressCommand mChangeCurrentByOneFromLongPressCommand; 343 344 /** 345 * {@link Animator} for showing the up/down arrows. 346 */ 347 private final AnimatorSet mShowInputControlsAnimator; 348 349 /** 350 * {@link Animator} for dimming the selector wheel. 351 */ 352 private final Animator mDimSelectorWheelAnimator; 353 354 /** 355 * The Y position of the last down event. 356 */ 357 private float mLastDownEventY; 358 359 /** 360 * The Y position of the last motion event. 361 */ 362 private float mLastMotionEventY; 363 364 /** 365 * Flag if to begin edit on next up event. 366 */ 367 private boolean mBeginEditOnUpEvent; 368 369 /** 370 * Flag if to adjust the selector wheel on next up event. 371 */ 372 private boolean mAdjustScrollerOnUpEvent; 373 374 /** 375 * The state of the selector wheel. 376 */ 377 private int mSelectorWheelState; 378 379 /** 380 * Determines speed during touch scrolling. 381 */ 382 private VelocityTracker mVelocityTracker; 383 384 /** 385 * @see ViewConfiguration#getScaledTouchSlop() 386 */ 387 private int mTouchSlop; 388 389 /** 390 * @see ViewConfiguration#getScaledMinimumFlingVelocity() 391 */ 392 private int mMinimumFlingVelocity; 393 394 /** 395 * @see ViewConfiguration#getScaledMaximumFlingVelocity() 396 */ 397 private int mMaximumFlingVelocity; 398 399 /** 400 * Flag whether the selector should wrap around. 401 */ 402 private boolean mWrapSelectorWheel; 403 404 /** 405 * The back ground color used to optimize scroller fading. 406 */ 407 private final int mSolidColor; 408 409 /** 410 * Flag indicating if this widget supports flinging. 411 */ 412 private final boolean mFlingable; 413 414 /** 415 * Divider for showing item to be selected while scrolling 416 */ 417 private final Drawable mSelectionDivider; 418 419 /** 420 * The height of the selection divider. 421 */ 422 private final int mSelectionDividerHeight; 423 424 /** 425 * Reusable {@link Rect} instance. 426 */ 427 private final Rect mTempRect = new Rect(); 428 429 /** 430 * The current scroll state of the number picker. 431 */ 432 private int mScrollState = OnScrollListener.SCROLL_STATE_IDLE; 433 434 /** 435 * The duration of the animation for showing the input controls. 436 */ 437 private final long mShowInputControlsAnimimationDuration; 438 439 /** 440 * Flag whether the scoll wheel and the fading edges have been initialized. 441 */ 442 private boolean mScrollWheelAndFadingEdgesInitialized; 443 444 /** 445 * Interface to listen for changes of the current value. 446 */ 447 public interface OnValueChangeListener { 448 449 /** 450 * Called upon a change of the current value. 451 * 452 * @param picker The NumberPicker associated with this listener. 453 * @param oldVal The previous value. 454 * @param newVal The new value. 455 */ 456 void onValueChange(NumberPicker picker, int oldVal, int newVal); 457 } 458 459 /** 460 * Interface to listen for the picker scroll state. 461 */ 462 public interface OnScrollListener { 463 464 /** 465 * The view is not scrolling. 466 */ 467 public static int SCROLL_STATE_IDLE = 0; 468 469 /** 470 * The user is scrolling using touch, and their finger is still on the screen. 471 */ 472 public static int SCROLL_STATE_TOUCH_SCROLL = 1; 473 474 /** 475 * The user had previously been scrolling using touch and performed a fling. 476 */ 477 public static int SCROLL_STATE_FLING = 2; 478 479 /** 480 * Callback invoked while the number picker scroll state has changed. 481 * 482 * @param view The view whose scroll state is being reported. 483 * @param scrollState The current scroll state. One of 484 * {@link #SCROLL_STATE_IDLE}, 485 * {@link #SCROLL_STATE_TOUCH_SCROLL} or 486 * {@link #SCROLL_STATE_IDLE}. 487 */ 488 public void onScrollStateChange(NumberPicker view, int scrollState); 489 } 490 491 /** 492 * Interface used to format current value into a string for presentation. 493 */ 494 public interface Formatter { 495 496 /** 497 * Formats a string representation of the current value. 498 * 499 * @param value The currently selected value. 500 * @return A formatted string representation. 501 */ 502 public String format(int value); 503 } 504 505 /** 506 * Create a new number picker. 507 * 508 * @param context The application environment. 509 */ 510 public NumberPicker(Context context) { 511 this(context, null); 512 } 513 514 /** 515 * Create a new number picker. 516 * 517 * @param context The application environment. 518 * @param attrs A collection of attributes. 519 */ 520 public NumberPicker(Context context, AttributeSet attrs) { 521 this(context, attrs, R.attr.numberPickerStyle); 522 } 523 524 /** 525 * Create a new number picker 526 * 527 * @param context the application environment. 528 * @param attrs a collection of attributes. 529 * @param defStyle The default style to apply to this view. 530 */ 531 public NumberPicker(Context context, AttributeSet attrs, int defStyle) { 532 super(context, attrs, defStyle); 533 534 // process style attributes 535 TypedArray attributesArray = context.obtainStyledAttributes(attrs, 536 R.styleable.NumberPicker, defStyle, 0); 537 mSolidColor = attributesArray.getColor(R.styleable.NumberPicker_solidColor, 0); 538 mFlingable = attributesArray.getBoolean(R.styleable.NumberPicker_flingable, true); 539 mSelectionDivider = attributesArray.getDrawable(R.styleable.NumberPicker_selectionDivider); 540 int defSelectionDividerHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 541 UNSCALED_DEFAULT_SELECTION_DIVIDER_HEIGHT, 542 getResources().getDisplayMetrics()); 543 mSelectionDividerHeight = attributesArray.getDimensionPixelSize( 544 R.styleable.NumberPicker_selectionDividerHeight, defSelectionDividerHeight); 545 mMinHeight = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_minHeight, 0); 546 mMaxHeight = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_maxHeight, 547 Integer.MAX_VALUE); 548 if (mMinHeight > mMaxHeight) { 549 throw new IllegalArgumentException("minHeight > maxHeight"); 550 } 551 mMinWidth = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_minWidth, 0); 552 mMaxWidth = attributesArray.getDimensionPixelSize(R.styleable.NumberPicker_maxWidth, 553 Integer.MAX_VALUE); 554 if (mMinWidth > mMaxWidth) { 555 throw new IllegalArgumentException("minWidth > maxWidth"); 556 } 557 mComputeMaxWidth = (mMaxWidth == Integer.MAX_VALUE); 558 attributesArray.recycle(); 559 560 mShowInputControlsAnimimationDuration = getResources().getInteger( 561 R.integer.config_longAnimTime); 562 563 // By default Linearlayout that we extend is not drawn. This is 564 // its draw() method is not called but dispatchDraw() is called 565 // directly (see ViewGroup.drawChild()). However, this class uses 566 // the fading edge effect implemented by View and we need our 567 // draw() method to be called. Therefore, we declare we will draw. 568 setWillNotDraw(false); 569 setSelectorWheelState(SELECTOR_WHEEL_STATE_NONE); 570 571 LayoutInflater inflater = (LayoutInflater) getContext().getSystemService( 572 Context.LAYOUT_INFLATER_SERVICE); 573 inflater.inflate(R.layout.number_picker, this, true); 574 575 OnClickListener onClickListener = new OnClickListener() { 576 public void onClick(View v) { 577 hideSoftInput(); 578 mInputText.clearFocus(); 579 if (v.getId() == R.id.increment) { 580 changeCurrentByOne(true); 581 } else { 582 changeCurrentByOne(false); 583 } 584 } 585 }; 586 587 OnLongClickListener onLongClickListener = new OnLongClickListener() { 588 public boolean onLongClick(View v) { 589 hideSoftInput(); 590 mInputText.clearFocus(); 591 if (v.getId() == R.id.increment) { 592 postChangeCurrentByOneFromLongPress(true); 593 } else { 594 postChangeCurrentByOneFromLongPress(false); 595 } 596 return true; 597 } 598 }; 599 600 // increment button 601 mIncrementButton = (ImageButton) findViewById(R.id.increment); 602 mIncrementButton.setOnClickListener(onClickListener); 603 mIncrementButton.setOnLongClickListener(onLongClickListener); 604 605 // decrement button 606 mDecrementButton = (ImageButton) findViewById(R.id.decrement); 607 mDecrementButton.setOnClickListener(onClickListener); 608 mDecrementButton.setOnLongClickListener(onLongClickListener); 609 610 // input text 611 mInputText = (EditText) findViewById(R.id.numberpicker_input); 612 mInputText.setOnFocusChangeListener(new OnFocusChangeListener() { 613 public void onFocusChange(View v, boolean hasFocus) { 614 if (hasFocus) { 615 mInputText.selectAll(); 616 InputMethodManager inputMethodManager = InputMethodManager.peekInstance(); 617 if (inputMethodManager != null) { 618 inputMethodManager.showSoftInput(mInputText, 0); 619 } 620 } else { 621 mInputText.setSelection(0, 0); 622 validateInputTextView(v); 623 } 624 } 625 }); 626 mInputText.setFilters(new InputFilter[] { 627 new InputTextFilter() 628 }); 629 630 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 631 632 // initialize constants 633 mTouchSlop = ViewConfiguration.getTapTimeout(); 634 ViewConfiguration configuration = ViewConfiguration.get(context); 635 mTouchSlop = configuration.getScaledTouchSlop(); 636 mMinimumFlingVelocity = configuration.getScaledMinimumFlingVelocity(); 637 mMaximumFlingVelocity = configuration.getScaledMaximumFlingVelocity() 638 / SELECTOR_MAX_FLING_VELOCITY_ADJUSTMENT; 639 mTextSize = (int) mInputText.getTextSize(); 640 641 // create the selector wheel paint 642 Paint paint = new Paint(); 643 paint.setAntiAlias(true); 644 paint.setTextAlign(Align.CENTER); 645 paint.setTextSize(mTextSize); 646 paint.setTypeface(mInputText.getTypeface()); 647 ColorStateList colors = mInputText.getTextColors(); 648 int color = colors.getColorForState(ENABLED_STATE_SET, Color.WHITE); 649 paint.setColor(color); 650 mSelectorWheelPaint = paint; 651 652 // create the animator for showing the input controls 653 mDimSelectorWheelAnimator = ObjectAnimator.ofInt(this, PROPERTY_SELECTOR_PAINT_ALPHA, 654 SELECTOR_WHEEL_BRIGHT_ALPHA, SELECTOR_WHEEL_DIM_ALPHA); 655 final ObjectAnimator showIncrementButton = ObjectAnimator.ofFloat(mIncrementButton, 656 PROPERTY_BUTTON_ALPHA, BUTTON_ALPHA_TRANSPARENT, BUTTON_ALPHA_OPAQUE); 657 final ObjectAnimator showDecrementButton = ObjectAnimator.ofFloat(mDecrementButton, 658 PROPERTY_BUTTON_ALPHA, BUTTON_ALPHA_TRANSPARENT, BUTTON_ALPHA_OPAQUE); 659 mShowInputControlsAnimator = new AnimatorSet(); 660 mShowInputControlsAnimator.playTogether(mDimSelectorWheelAnimator, showIncrementButton, 661 showDecrementButton); 662 mShowInputControlsAnimator.addListener(new AnimatorListenerAdapter() { 663 private boolean mCanceled = false; 664 665 @Override 666 public void onAnimationEnd(Animator animation) { 667 if (!mCanceled) { 668 // if canceled => we still want the wheel drawn 669 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 670 } 671 mCanceled = false; 672 } 673 674 @Override 675 public void onAnimationCancel(Animator animation) { 676 if (mShowInputControlsAnimator.isRunning()) { 677 mCanceled = true; 678 } 679 } 680 }); 681 682 // create the fling and adjust scrollers 683 mFlingScroller = new Scroller(getContext(), null, true); 684 mAdjustScroller = new Scroller(getContext(), new DecelerateInterpolator(2.5f)); 685 686 updateInputTextView(); 687 updateIncrementAndDecrementButtonsVisibilityState(); 688 689 if (mFlingable) { 690 if (isInEditMode()) { 691 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 692 } else { 693 // Start with shown selector wheel and hidden controls. When made 694 // visible hide the selector and fade-in the controls to suggest 695 // fling interaction. 696 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 697 hideInputControls(); 698 } 699 } 700 } 701 702 @Override 703 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 704 final int msrdWdth = getMeasuredWidth(); 705 final int msrdHght = getMeasuredHeight(); 706 707 // Increment button at the top. 708 final int inctBtnMsrdWdth = mIncrementButton.getMeasuredWidth(); 709 final int incrBtnLeft = (msrdWdth - inctBtnMsrdWdth) / 2; 710 final int incrBtnTop = 0; 711 final int incrBtnRight = incrBtnLeft + inctBtnMsrdWdth; 712 final int incrBtnBottom = incrBtnTop + mIncrementButton.getMeasuredHeight(); 713 mIncrementButton.layout(incrBtnLeft, incrBtnTop, incrBtnRight, incrBtnBottom); 714 715 // Input text centered horizontally. 716 final int inptTxtMsrdWdth = mInputText.getMeasuredWidth(); 717 final int inptTxtMsrdHght = mInputText.getMeasuredHeight(); 718 final int inptTxtLeft = (msrdWdth - inptTxtMsrdWdth) / 2; 719 final int inptTxtTop = (msrdHght - inptTxtMsrdHght) / 2; 720 final int inptTxtRight = inptTxtLeft + inptTxtMsrdWdth; 721 final int inptTxtBottom = inptTxtTop + inptTxtMsrdHght; 722 mInputText.layout(inptTxtLeft, inptTxtTop, inptTxtRight, inptTxtBottom); 723 724 // Decrement button at the top. 725 final int decrBtnMsrdWdth = mIncrementButton.getMeasuredWidth(); 726 final int decrBtnLeft = (msrdWdth - decrBtnMsrdWdth) / 2; 727 final int decrBtnTop = msrdHght - mDecrementButton.getMeasuredHeight(); 728 final int decrBtnRight = decrBtnLeft + decrBtnMsrdWdth; 729 final int decrBtnBottom = msrdHght; 730 mDecrementButton.layout(decrBtnLeft, decrBtnTop, decrBtnRight, decrBtnBottom); 731 732 if (!mScrollWheelAndFadingEdgesInitialized) { 733 mScrollWheelAndFadingEdgesInitialized = true; 734 // need to do all this when we know our size 735 initializeSelectorWheel(); 736 initializeFadingEdges(); 737 } 738 } 739 740 @Override 741 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 742 final int newWidthMeasureSpec = makeMeasureSpec(widthMeasureSpec, mMinWidth, mMaxWidth); 743 final int newHeightMeasureSpec = makeMeasureSpec(heightMeasureSpec, mMinHeight, mMaxHeight); 744 super.onMeasure(newWidthMeasureSpec, newHeightMeasureSpec); 745 } 746 747 @Override 748 public boolean onInterceptTouchEvent(MotionEvent event) { 749 if (!isEnabled() || !mFlingable) { 750 return false; 751 } 752 switch (event.getActionMasked()) { 753 case MotionEvent.ACTION_DOWN: 754 mLastMotionEventY = mLastDownEventY = event.getY(); 755 removeAllCallbacks(); 756 mShowInputControlsAnimator.cancel(); 757 mDimSelectorWheelAnimator.cancel(); 758 mBeginEditOnUpEvent = false; 759 mAdjustScrollerOnUpEvent = true; 760 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 761 boolean scrollersFinished = mFlingScroller.isFinished() 762 && mAdjustScroller.isFinished(); 763 if (!scrollersFinished) { 764 mFlingScroller.forceFinished(true); 765 mAdjustScroller.forceFinished(true); 766 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 767 } 768 mBeginEditOnUpEvent = scrollersFinished; 769 mAdjustScrollerOnUpEvent = true; 770 hideSoftInput(); 771 hideInputControls(); 772 return true; 773 } 774 if (isEventInVisibleViewHitRect(event, mIncrementButton) 775 || isEventInVisibleViewHitRect(event, mDecrementButton)) { 776 return false; 777 } 778 mAdjustScrollerOnUpEvent = false; 779 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 780 hideSoftInput(); 781 hideInputControls(); 782 return true; 783 case MotionEvent.ACTION_MOVE: 784 float currentMoveY = event.getY(); 785 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 786 if (deltaDownY > mTouchSlop) { 787 mBeginEditOnUpEvent = false; 788 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 789 setSelectorWheelState(SELECTOR_WHEEL_STATE_LARGE); 790 hideSoftInput(); 791 hideInputControls(); 792 return true; 793 } 794 break; 795 } 796 return false; 797 } 798 799 @Override 800 public boolean onTouchEvent(MotionEvent ev) { 801 if (!isEnabled()) { 802 return false; 803 } 804 if (mVelocityTracker == null) { 805 mVelocityTracker = VelocityTracker.obtain(); 806 } 807 mVelocityTracker.addMovement(ev); 808 int action = ev.getActionMasked(); 809 switch (action) { 810 case MotionEvent.ACTION_MOVE: 811 float currentMoveY = ev.getY(); 812 if (mBeginEditOnUpEvent 813 || mScrollState != OnScrollListener.SCROLL_STATE_TOUCH_SCROLL) { 814 int deltaDownY = (int) Math.abs(currentMoveY - mLastDownEventY); 815 if (deltaDownY > mTouchSlop) { 816 mBeginEditOnUpEvent = false; 817 onScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 818 } 819 } 820 int deltaMoveY = (int) (currentMoveY - mLastMotionEventY); 821 scrollBy(0, deltaMoveY); 822 invalidate(); 823 mLastMotionEventY = currentMoveY; 824 break; 825 case MotionEvent.ACTION_UP: 826 if (mBeginEditOnUpEvent) { 827 setSelectorWheelState(SELECTOR_WHEEL_STATE_SMALL); 828 showInputControls(mShowInputControlsAnimimationDuration); 829 mInputText.requestFocus(); 830 return true; 831 } 832 VelocityTracker velocityTracker = mVelocityTracker; 833 velocityTracker.computeCurrentVelocity(1000, mMaximumFlingVelocity); 834 int initialVelocity = (int) velocityTracker.getYVelocity(); 835 if (Math.abs(initialVelocity) > mMinimumFlingVelocity) { 836 fling(initialVelocity); 837 onScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 838 } else { 839 if (mAdjustScrollerOnUpEvent) { 840 if (mFlingScroller.isFinished() && mAdjustScroller.isFinished()) { 841 postAdjustScrollerCommand(0); 842 } 843 } else { 844 postAdjustScrollerCommand(SHOW_INPUT_CONTROLS_DELAY_MILLIS); 845 } 846 } 847 mVelocityTracker.recycle(); 848 mVelocityTracker = null; 849 break; 850 } 851 return true; 852 } 853 854 @Override 855 public boolean dispatchTouchEvent(MotionEvent event) { 856 final int action = event.getActionMasked(); 857 switch (action) { 858 case MotionEvent.ACTION_MOVE: 859 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 860 removeAllCallbacks(); 861 forceCompleteChangeCurrentByOneViaScroll(); 862 } 863 break; 864 case MotionEvent.ACTION_CANCEL: 865 case MotionEvent.ACTION_UP: 866 removeAllCallbacks(); 867 break; 868 } 869 return super.dispatchTouchEvent(event); 870 } 871 872 @Override 873 public boolean dispatchKeyEvent(KeyEvent event) { 874 int keyCode = event.getKeyCode(); 875 if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) { 876 removeAllCallbacks(); 877 } 878 return super.dispatchKeyEvent(event); 879 } 880 881 @Override 882 public boolean dispatchTrackballEvent(MotionEvent event) { 883 int action = event.getActionMasked(); 884 if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) { 885 removeAllCallbacks(); 886 } 887 return super.dispatchTrackballEvent(event); 888 } 889 890 @Override 891 public void computeScroll() { 892 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 893 return; 894 } 895 Scroller scroller = mFlingScroller; 896 if (scroller.isFinished()) { 897 scroller = mAdjustScroller; 898 if (scroller.isFinished()) { 899 return; 900 } 901 } 902 scroller.computeScrollOffset(); 903 int currentScrollerY = scroller.getCurrY(); 904 if (mPreviousScrollerY == 0) { 905 mPreviousScrollerY = scroller.getStartY(); 906 } 907 scrollBy(0, currentScrollerY - mPreviousScrollerY); 908 mPreviousScrollerY = currentScrollerY; 909 if (scroller.isFinished()) { 910 onScrollerFinished(scroller); 911 } else { 912 invalidate(); 913 } 914 } 915 916 @Override 917 public void setEnabled(boolean enabled) { 918 super.setEnabled(enabled); 919 mIncrementButton.setEnabled(enabled); 920 mDecrementButton.setEnabled(enabled); 921 mInputText.setEnabled(enabled); 922 } 923 924 @Override 925 public void scrollBy(int x, int y) { 926 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 927 return; 928 } 929 int[] selectorIndices = mSelectorIndices; 930 if (!mWrapSelectorWheel && y > 0 931 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 932 mCurrentScrollOffset = mInitialScrollOffset; 933 return; 934 } 935 if (!mWrapSelectorWheel && y < 0 936 && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 937 mCurrentScrollOffset = mInitialScrollOffset; 938 return; 939 } 940 mCurrentScrollOffset += y; 941 while (mCurrentScrollOffset - mInitialScrollOffset > mSelectorTextGapHeight) { 942 mCurrentScrollOffset -= mSelectorElementHeight; 943 decrementSelectorIndices(selectorIndices); 944 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 945 if (!mWrapSelectorWheel && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] <= mMinValue) { 946 mCurrentScrollOffset = mInitialScrollOffset; 947 } 948 } 949 while (mCurrentScrollOffset - mInitialScrollOffset < -mSelectorTextGapHeight) { 950 mCurrentScrollOffset += mSelectorElementHeight; 951 incrementSelectorIndices(selectorIndices); 952 changeCurrent(selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX]); 953 if (!mWrapSelectorWheel && selectorIndices[SELECTOR_MIDDLE_ITEM_INDEX] >= mMaxValue) { 954 mCurrentScrollOffset = mInitialScrollOffset; 955 } 956 } 957 } 958 959 @Override 960 public int getSolidColor() { 961 return mSolidColor; 962 } 963 964 /** 965 * Sets the listener to be notified on change of the current value. 966 * 967 * @param onValueChangedListener The listener. 968 */ 969 public void setOnValueChangedListener(OnValueChangeListener onValueChangedListener) { 970 mOnValueChangeListener = onValueChangedListener; 971 } 972 973 /** 974 * Set listener to be notified for scroll state changes. 975 * 976 * @param onScrollListener The listener. 977 */ 978 public void setOnScrollListener(OnScrollListener onScrollListener) { 979 mOnScrollListener = onScrollListener; 980 } 981 982 /** 983 * Set the formatter to be used for formatting the current value. 984 * <p> 985 * Note: If you have provided alternative values for the values this 986 * formatter is never invoked. 987 * </p> 988 * 989 * @param formatter The formatter object. If formatter is <code>null</code>, 990 * {@link String#valueOf(int)} will be used. 991 * 992 * @see #setDisplayedValues(String[]) 993 */ 994 public void setFormatter(Formatter formatter) { 995 if (formatter == mFormatter) { 996 return; 997 } 998 mFormatter = formatter; 999 initializeSelectorWheelIndices(); 1000 updateInputTextView(); 1001 } 1002 1003 /** 1004 * Set the current value for the number picker. 1005 * <p> 1006 * If the argument is less than the {@link NumberPicker#getMinValue()} and 1007 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 1008 * current value is set to the {@link NumberPicker#getMinValue()} value. 1009 * </p> 1010 * <p> 1011 * If the argument is less than the {@link NumberPicker#getMinValue()} and 1012 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 1013 * current value is set to the {@link NumberPicker#getMaxValue()} value. 1014 * </p> 1015 * <p> 1016 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 1017 * {@link NumberPicker#getWrapSelectorWheel()} is <code>false</code> the 1018 * current value is set to the {@link NumberPicker#getMaxValue()} value. 1019 * </p> 1020 * <p> 1021 * If the argument is less than the {@link NumberPicker#getMaxValue()} and 1022 * {@link NumberPicker#getWrapSelectorWheel()} is <code>true</code> the 1023 * current value is set to the {@link NumberPicker#getMinValue()} value. 1024 * </p> 1025 * 1026 * @param value The current value. 1027 * @see #setWrapSelectorWheel(boolean) 1028 * @see #setMinValue(int) 1029 * @see #setMaxValue(int) 1030 */ 1031 public void setValue(int value) { 1032 if (mValue == value) { 1033 return; 1034 } 1035 if (value < mMinValue) { 1036 value = mWrapSelectorWheel ? mMaxValue : mMinValue; 1037 } 1038 if (value > mMaxValue) { 1039 value = mWrapSelectorWheel ? mMinValue : mMaxValue; 1040 } 1041 mValue = value; 1042 initializeSelectorWheelIndices(); 1043 updateInputTextView(); 1044 updateIncrementAndDecrementButtonsVisibilityState(); 1045 invalidate(); 1046 } 1047 1048 /** 1049 * Hides the soft input of it is active for the input text. 1050 */ 1051 private void hideSoftInput() { 1052 InputMethodManager inputMethodManager = InputMethodManager.peekInstance(); 1053 if (inputMethodManager != null && inputMethodManager.isActive(mInputText)) { 1054 inputMethodManager.hideSoftInputFromWindow(getWindowToken(), 0); 1055 } 1056 } 1057 1058 /** 1059 * Computes the max width if no such specified as an attribute. 1060 */ 1061 private void tryComputeMaxWidth() { 1062 if (!mComputeMaxWidth) { 1063 return; 1064 } 1065 int maxTextWidth = 0; 1066 if (mDisplayedValues == null) { 1067 float maxDigitWidth = 0; 1068 for (int i = 0; i <= 9; i++) { 1069 final float digitWidth = mSelectorWheelPaint.measureText(String.valueOf(i)); 1070 if (digitWidth > maxDigitWidth) { 1071 maxDigitWidth = digitWidth; 1072 } 1073 } 1074 int numberOfDigits = 0; 1075 int current = mMaxValue; 1076 while (current > 0) { 1077 numberOfDigits++; 1078 current = current / 10; 1079 } 1080 maxTextWidth = (int) (numberOfDigits * maxDigitWidth); 1081 } else { 1082 final int valueCount = mDisplayedValues.length; 1083 for (int i = 0; i < valueCount; i++) { 1084 final float textWidth = mSelectorWheelPaint.measureText(mDisplayedValues[i]); 1085 if (textWidth > maxTextWidth) { 1086 maxTextWidth = (int) textWidth; 1087 } 1088 } 1089 } 1090 maxTextWidth += mInputText.getPaddingLeft() + mInputText.getPaddingRight(); 1091 if (mMaxWidth != maxTextWidth) { 1092 if (maxTextWidth > mMinWidth) { 1093 mMaxWidth = maxTextWidth; 1094 } else { 1095 mMaxWidth = mMinWidth; 1096 } 1097 invalidate(); 1098 } 1099 } 1100 1101 /** 1102 * Gets whether the selector wheel wraps when reaching the min/max value. 1103 * 1104 * @return True if the selector wheel wraps. 1105 * 1106 * @see #getMinValue() 1107 * @see #getMaxValue() 1108 */ 1109 public boolean getWrapSelectorWheel() { 1110 return mWrapSelectorWheel; 1111 } 1112 1113 /** 1114 * Sets whether the selector wheel shown during flinging/scrolling should 1115 * wrap around the {@link NumberPicker#getMinValue()} and 1116 * {@link NumberPicker#getMaxValue()} values. 1117 * <p> 1118 * By default if the range (max - min) is more than five (the number of 1119 * items shown on the selector wheel) the selector wheel wrapping is 1120 * enabled. 1121 * </p> 1122 * 1123 * @param wrapSelectorWheel Whether to wrap. 1124 */ 1125 public void setWrapSelectorWheel(boolean wrapSelectorWheel) { 1126 if (wrapSelectorWheel && (mMaxValue - mMinValue) < mSelectorIndices.length) { 1127 throw new IllegalStateException("Range less than selector items count."); 1128 } 1129 if (wrapSelectorWheel != mWrapSelectorWheel) { 1130 mWrapSelectorWheel = wrapSelectorWheel; 1131 updateIncrementAndDecrementButtonsVisibilityState(); 1132 } 1133 } 1134 1135 /** 1136 * Sets the speed at which the numbers be incremented and decremented when 1137 * the up and down buttons are long pressed respectively. 1138 * <p> 1139 * The default value is 300 ms. 1140 * </p> 1141 * 1142 * @param intervalMillis The speed (in milliseconds) at which the numbers 1143 * will be incremented and decremented. 1144 */ 1145 public void setOnLongPressUpdateInterval(long intervalMillis) { 1146 mLongPressUpdateInterval = intervalMillis; 1147 } 1148 1149 /** 1150 * Returns the value of the picker. 1151 * 1152 * @return The value. 1153 */ 1154 public int getValue() { 1155 return mValue; 1156 } 1157 1158 /** 1159 * Returns the min value of the picker. 1160 * 1161 * @return The min value 1162 */ 1163 public int getMinValue() { 1164 return mMinValue; 1165 } 1166 1167 /** 1168 * Sets the min value of the picker. 1169 * 1170 * @param minValue The min value. 1171 */ 1172 public void setMinValue(int minValue) { 1173 if (mMinValue == minValue) { 1174 return; 1175 } 1176 if (minValue < 0) { 1177 throw new IllegalArgumentException("minValue must be >= 0"); 1178 } 1179 mMinValue = minValue; 1180 if (mMinValue > mValue) { 1181 mValue = mMinValue; 1182 } 1183 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1184 setWrapSelectorWheel(wrapSelectorWheel); 1185 initializeSelectorWheelIndices(); 1186 updateInputTextView(); 1187 tryComputeMaxWidth(); 1188 } 1189 1190 /** 1191 * Returns the max value of the picker. 1192 * 1193 * @return The max value. 1194 */ 1195 public int getMaxValue() { 1196 return mMaxValue; 1197 } 1198 1199 /** 1200 * Sets the max value of the picker. 1201 * 1202 * @param maxValue The max value. 1203 */ 1204 public void setMaxValue(int maxValue) { 1205 if (mMaxValue == maxValue) { 1206 return; 1207 } 1208 if (maxValue < 0) { 1209 throw new IllegalArgumentException("maxValue must be >= 0"); 1210 } 1211 mMaxValue = maxValue; 1212 if (mMaxValue < mValue) { 1213 mValue = mMaxValue; 1214 } 1215 boolean wrapSelectorWheel = mMaxValue - mMinValue > mSelectorIndices.length; 1216 setWrapSelectorWheel(wrapSelectorWheel); 1217 initializeSelectorWheelIndices(); 1218 updateInputTextView(); 1219 tryComputeMaxWidth(); 1220 } 1221 1222 /** 1223 * Gets the values to be displayed instead of string values. 1224 * 1225 * @return The displayed values. 1226 */ 1227 public String[] getDisplayedValues() { 1228 return mDisplayedValues; 1229 } 1230 1231 /** 1232 * Sets the values to be displayed. 1233 * 1234 * @param displayedValues The displayed values. 1235 */ 1236 public void setDisplayedValues(String[] displayedValues) { 1237 if (mDisplayedValues == displayedValues) { 1238 return; 1239 } 1240 mDisplayedValues = displayedValues; 1241 if (mDisplayedValues != null) { 1242 // Allow text entry rather than strictly numeric entry. 1243 mInputText.setRawInputType(InputType.TYPE_CLASS_TEXT 1244 | InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS); 1245 } else { 1246 mInputText.setRawInputType(InputType.TYPE_CLASS_NUMBER); 1247 } 1248 updateInputTextView(); 1249 initializeSelectorWheelIndices(); 1250 } 1251 1252 @Override 1253 protected float getTopFadingEdgeStrength() { 1254 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1255 } 1256 1257 @Override 1258 protected float getBottomFadingEdgeStrength() { 1259 return TOP_AND_BOTTOM_FADING_EDGE_STRENGTH; 1260 } 1261 1262 @Override 1263 protected void onAttachedToWindow() { 1264 super.onAttachedToWindow(); 1265 // make sure we show the controls only the very 1266 // first time the user sees this widget 1267 if (mFlingable && !isInEditMode()) { 1268 // animate a bit slower the very first time 1269 showInputControls(mShowInputControlsAnimimationDuration * 2); 1270 } 1271 } 1272 1273 @Override 1274 protected void onDetachedFromWindow() { 1275 removeAllCallbacks(); 1276 } 1277 1278 @Override 1279 protected void dispatchDraw(Canvas canvas) { 1280 // There is a good reason for doing this. See comments in draw(). 1281 } 1282 1283 @Override 1284 public void draw(Canvas canvas) { 1285 // Dispatch draw to our children only if we are not currently running 1286 // the animation for simultaneously dimming the scroll wheel and 1287 // showing in the buttons. This class takes advantage of the View 1288 // implementation of fading edges effect to draw the selector wheel. 1289 // However, in View.draw(), the fading is applied after all the children 1290 // have been drawn and we do not want this fading to be applied to the 1291 // buttons. Therefore, we draw our children after we have completed 1292 // drawing ourselves. 1293 super.draw(canvas); 1294 1295 // Draw our children if we are not showing the selector wheel of fading 1296 // it out 1297 if (mShowInputControlsAnimator.isRunning() 1298 || mSelectorWheelState != SELECTOR_WHEEL_STATE_LARGE) { 1299 long drawTime = getDrawingTime(); 1300 for (int i = 0, count = getChildCount(); i < count; i++) { 1301 View child = getChildAt(i); 1302 if (!child.isShown()) { 1303 continue; 1304 } 1305 drawChild(canvas, getChildAt(i), drawTime); 1306 } 1307 } 1308 } 1309 1310 @Override 1311 protected void onDraw(Canvas canvas) { 1312 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_NONE) { 1313 return; 1314 } 1315 1316 float x = (mRight - mLeft) / 2; 1317 float y = mCurrentScrollOffset; 1318 1319 final int restoreCount = canvas.save(); 1320 1321 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_SMALL) { 1322 Rect clipBounds = canvas.getClipBounds(); 1323 clipBounds.inset(0, mSelectorElementHeight); 1324 canvas.clipRect(clipBounds); 1325 } 1326 1327 // draw the selector wheel 1328 int[] selectorIndices = mSelectorIndices; 1329 for (int i = 0; i < selectorIndices.length; i++) { 1330 int selectorIndex = selectorIndices[i]; 1331 String scrollSelectorValue = mSelectorIndexToStringCache.get(selectorIndex); 1332 // Do not draw the middle item if input is visible since the input is shown only 1333 // if the wheel is static and it covers the middle item. Otherwise, if the user 1334 // starts editing the text via the IME he may see a dimmed version of the old 1335 // value intermixed with the new one. 1336 if (i != SELECTOR_MIDDLE_ITEM_INDEX || mInputText.getVisibility() != VISIBLE) { 1337 canvas.drawText(scrollSelectorValue, x, y, mSelectorWheelPaint); 1338 } 1339 y += mSelectorElementHeight; 1340 } 1341 1342 // draw the selection dividers (only if scrolling and drawable specified) 1343 if (mSelectionDivider != null) { 1344 // draw the top divider 1345 int topOfTopDivider = 1346 (getHeight() - mSelectorElementHeight - mSelectionDividerHeight) / 2; 1347 int bottomOfTopDivider = topOfTopDivider + mSelectionDividerHeight; 1348 mSelectionDivider.setBounds(0, topOfTopDivider, mRight, bottomOfTopDivider); 1349 mSelectionDivider.draw(canvas); 1350 1351 // draw the bottom divider 1352 int topOfBottomDivider = topOfTopDivider + mSelectorElementHeight; 1353 int bottomOfBottomDivider = bottomOfTopDivider + mSelectorElementHeight; 1354 mSelectionDivider.setBounds(0, topOfBottomDivider, mRight, bottomOfBottomDivider); 1355 mSelectionDivider.draw(canvas); 1356 } 1357 1358 canvas.restoreToCount(restoreCount); 1359 } 1360 1361 @Override 1362 public void sendAccessibilityEvent(int eventType) { 1363 // Do not send accessibility events - we want the user to 1364 // perceive this widget as several controls rather as a whole. 1365 } 1366 1367 /** 1368 * Makes a measure spec that tries greedily to use the max value. 1369 * 1370 * @param measureSpec The measure spec. 1371 * @param maxValue The max value for the size. 1372 * @return A measure spec greedily imposing the max size. 1373 */ 1374 private int makeMeasureSpec(int measureSpec, int minValue, int maxValue) { 1375 final int size = MeasureSpec.getSize(measureSpec); 1376 if (size < minValue) { 1377 throw new IllegalArgumentException("Available space is less than min size: " 1378 + size + " < " + minValue); 1379 } 1380 final int mode = MeasureSpec.getMode(measureSpec); 1381 switch (mode) { 1382 case MeasureSpec.EXACTLY: 1383 return measureSpec; 1384 case MeasureSpec.AT_MOST: 1385 return MeasureSpec.makeMeasureSpec(Math.min(size, maxValue), MeasureSpec.EXACTLY); 1386 case MeasureSpec.UNSPECIFIED: 1387 return MeasureSpec.makeMeasureSpec(maxValue, MeasureSpec.EXACTLY); 1388 default: 1389 throw new IllegalArgumentException("Unknown measure mode: " + mode); 1390 } 1391 } 1392 1393 /** 1394 * Resets the selector indices and clear the cached 1395 * string representation of these indices. 1396 */ 1397 private void initializeSelectorWheelIndices() { 1398 mSelectorIndexToStringCache.clear(); 1399 int[] selectorIdices = mSelectorIndices; 1400 int current = getValue(); 1401 for (int i = 0; i < mSelectorIndices.length; i++) { 1402 int selectorIndex = current + (i - SELECTOR_MIDDLE_ITEM_INDEX); 1403 if (mWrapSelectorWheel) { 1404 selectorIndex = getWrappedSelectorIndex(selectorIndex); 1405 } 1406 mSelectorIndices[i] = selectorIndex; 1407 ensureCachedScrollSelectorValue(mSelectorIndices[i]); 1408 } 1409 } 1410 1411 /** 1412 * Sets the current value of this NumberPicker, and sets mPrevious to the 1413 * previous value. If current is greater than mEnd less than mStart, the 1414 * value of mCurrent is wrapped around. Subclasses can override this to 1415 * change the wrapping behavior 1416 * 1417 * @param current the new value of the NumberPicker 1418 */ 1419 private void changeCurrent(int current) { 1420 if (mValue == current) { 1421 return; 1422 } 1423 // Wrap around the values if we go past the start or end 1424 if (mWrapSelectorWheel) { 1425 current = getWrappedSelectorIndex(current); 1426 } 1427 int previous = mValue; 1428 setValue(current); 1429 notifyChange(previous, current); 1430 } 1431 1432 /** 1433 * Changes the current value by one which is increment or 1434 * decrement based on the passes argument. 1435 * 1436 * @param increment True to increment, false to decrement. 1437 */ 1438 private void changeCurrentByOne(boolean increment) { 1439 if (mFlingable) { 1440 mDimSelectorWheelAnimator.cancel(); 1441 mInputText.setVisibility(View.INVISIBLE); 1442 mSelectorWheelPaint.setAlpha(SELECTOR_WHEEL_BRIGHT_ALPHA); 1443 mPreviousScrollerY = 0; 1444 forceCompleteChangeCurrentByOneViaScroll(); 1445 if (increment) { 1446 mFlingScroller.startScroll(0, 0, 0, -mSelectorElementHeight, 1447 CHANGE_CURRENT_BY_ONE_SCROLL_DURATION); 1448 } else { 1449 mFlingScroller.startScroll(0, 0, 0, mSelectorElementHeight, 1450 CHANGE_CURRENT_BY_ONE_SCROLL_DURATION); 1451 } 1452 invalidate(); 1453 } else { 1454 if (increment) { 1455 changeCurrent(mValue + 1); 1456 } else { 1457 changeCurrent(mValue - 1); 1458 } 1459 } 1460 } 1461 1462 /** 1463 * Ensures that if we are in the process of changing the current value 1464 * by one via scrolling the scroller gets to its final state and the 1465 * value is updated. 1466 */ 1467 private void forceCompleteChangeCurrentByOneViaScroll() { 1468 Scroller scroller = mFlingScroller; 1469 if (!scroller.isFinished()) { 1470 final int yBeforeAbort = scroller.getCurrY(); 1471 scroller.abortAnimation(); 1472 final int yDelta = scroller.getCurrY() - yBeforeAbort; 1473 scrollBy(0, yDelta); 1474 } 1475 } 1476 1477 /** 1478 * Sets the <code>alpha</code> of the {@link Paint} for drawing the selector 1479 * wheel. 1480 */ 1481 @SuppressWarnings("unused") 1482 // Called via reflection 1483 private void setSelectorPaintAlpha(int alpha) { 1484 mSelectorWheelPaint.setAlpha(alpha); 1485 invalidate(); 1486 } 1487 1488 /** 1489 * @return If the <code>event</code> is in the visible <code>view</code>. 1490 */ 1491 private boolean isEventInVisibleViewHitRect(MotionEvent event, View view) { 1492 if (view.getVisibility() == VISIBLE) { 1493 view.getHitRect(mTempRect); 1494 return mTempRect.contains((int) event.getX(), (int) event.getY()); 1495 } 1496 return false; 1497 } 1498 1499 /** 1500 * Sets the <code>selectorWheelState</code>. 1501 */ 1502 private void setSelectorWheelState(int selectorWheelState) { 1503 mSelectorWheelState = selectorWheelState; 1504 if (selectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 1505 mSelectorWheelPaint.setAlpha(SELECTOR_WHEEL_BRIGHT_ALPHA); 1506 } 1507 1508 if (mFlingable && selectorWheelState == SELECTOR_WHEEL_STATE_LARGE 1509 && AccessibilityManager.getInstance(mContext).isEnabled()) { 1510 AccessibilityManager.getInstance(mContext).interrupt(); 1511 String text = mContext.getString(R.string.number_picker_increment_scroll_action); 1512 mInputText.setContentDescription(text); 1513 mInputText.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED); 1514 mInputText.setContentDescription(null); 1515 } 1516 } 1517 1518 private void initializeSelectorWheel() { 1519 initializeSelectorWheelIndices(); 1520 int[] selectorIndices = mSelectorIndices; 1521 int totalTextHeight = selectorIndices.length * mTextSize; 1522 float totalTextGapHeight = (mBottom - mTop) - totalTextHeight; 1523 float textGapCount = selectorIndices.length - 1; 1524 mSelectorTextGapHeight = (int) (totalTextGapHeight / textGapCount + 0.5f); 1525 mSelectorElementHeight = mTextSize + mSelectorTextGapHeight; 1526 // Ensure that the middle item is positioned the same as the text in mInputText 1527 int editTextTextPosition = mInputText.getBaseline() + mInputText.getTop(); 1528 mInitialScrollOffset = editTextTextPosition - 1529 (mSelectorElementHeight * SELECTOR_MIDDLE_ITEM_INDEX); 1530 mCurrentScrollOffset = mInitialScrollOffset; 1531 updateInputTextView(); 1532 } 1533 1534 private void initializeFadingEdges() { 1535 setVerticalFadingEdgeEnabled(true); 1536 setFadingEdgeLength((mBottom - mTop - mTextSize) / 2); 1537 } 1538 1539 /** 1540 * Callback invoked upon completion of a given <code>scroller</code>. 1541 */ 1542 private void onScrollerFinished(Scroller scroller) { 1543 if (scroller == mFlingScroller) { 1544 if (mSelectorWheelState == SELECTOR_WHEEL_STATE_LARGE) { 1545 postAdjustScrollerCommand(0); 1546 onScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 1547 } else { 1548 updateInputTextView(); 1549 fadeSelectorWheel(mShowInputControlsAnimimationDuration); 1550 } 1551 } else { 1552 updateInputTextView(); 1553 showInputControls(mShowInputControlsAnimimationDuration); 1554 } 1555 } 1556 1557 /** 1558 * Handles transition to a given <code>scrollState</code> 1559 */ 1560 private void onScrollStateChange(int scrollState) { 1561 if (mScrollState == scrollState) { 1562 return; 1563 } 1564 mScrollState = scrollState; 1565 if (mOnScrollListener != null) { 1566 mOnScrollListener.onScrollStateChange(this, scrollState); 1567 } 1568 } 1569 1570 /** 1571 * Flings the selector with the given <code>velocityY</code>. 1572 */ 1573 private void fling(int velocityY) { 1574 mPreviousScrollerY = 0; 1575 Scroller flingScroller = mFlingScroller; 1576 1577 if (mWrapSelectorWheel) { 1578 if (velocityY > 0) { 1579 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1580 } else { 1581 flingScroller.fling(0, Integer.MAX_VALUE, 0, velocityY, 0, 0, 0, Integer.MAX_VALUE); 1582 } 1583 } else { 1584 if (velocityY > 0) { 1585 int maxY = mTextSize * (mValue - mMinValue); 1586 flingScroller.fling(0, 0, 0, velocityY, 0, 0, 0, maxY); 1587 } else { 1588 int startY = mTextSize * (mMaxValue - mValue); 1589 int maxY = startY; 1590 flingScroller.fling(0, startY, 0, velocityY, 0, 0, 0, maxY); 1591 } 1592 } 1593 1594 invalidate(); 1595 } 1596 1597 /** 1598 * Hides the input controls which is the up/down arrows and the text field. 1599 */ 1600 private void hideInputControls() { 1601 mShowInputControlsAnimator.cancel(); 1602 mIncrementButton.setVisibility(INVISIBLE); 1603 mDecrementButton.setVisibility(INVISIBLE); 1604 mInputText.setVisibility(INVISIBLE); 1605 } 1606 1607 /** 1608 * Show the input controls by making them visible and animating the alpha 1609 * property up/down arrows. 1610 * 1611 * @param animationDuration The duration of the animation. 1612 */ 1613 private void showInputControls(long animationDuration) { 1614 updateIncrementAndDecrementButtonsVisibilityState(); 1615 mInputText.setVisibility(VISIBLE); 1616 mShowInputControlsAnimator.setDuration(animationDuration); 1617 mShowInputControlsAnimator.start(); 1618 } 1619 1620 /** 1621 * Fade the selector wheel via an animation. 1622 * 1623 * @param animationDuration The duration of the animation. 1624 */ 1625 private void fadeSelectorWheel(long animationDuration) { 1626 mInputText.setVisibility(VISIBLE); 1627 mDimSelectorWheelAnimator.setDuration(animationDuration); 1628 mDimSelectorWheelAnimator.start(); 1629 } 1630 1631 /** 1632 * Updates the visibility state of the increment and decrement buttons. 1633 */ 1634 private void updateIncrementAndDecrementButtonsVisibilityState() { 1635 if (mWrapSelectorWheel || mValue < mMaxValue) { 1636 mIncrementButton.setVisibility(VISIBLE); 1637 } else { 1638 mIncrementButton.setVisibility(INVISIBLE); 1639 } 1640 if (mWrapSelectorWheel || mValue > mMinValue) { 1641 mDecrementButton.setVisibility(VISIBLE); 1642 } else { 1643 mDecrementButton.setVisibility(INVISIBLE); 1644 } 1645 } 1646 1647 /** 1648 * @return The wrapped index <code>selectorIndex</code> value. 1649 */ 1650 private int getWrappedSelectorIndex(int selectorIndex) { 1651 if (selectorIndex > mMaxValue) { 1652 return mMinValue + (selectorIndex - mMaxValue) % (mMaxValue - mMinValue) - 1; 1653 } else if (selectorIndex < mMinValue) { 1654 return mMaxValue - (mMinValue - selectorIndex) % (mMaxValue - mMinValue) + 1; 1655 } 1656 return selectorIndex; 1657 } 1658 1659 /** 1660 * Increments the <code>selectorIndices</code> whose string representations 1661 * will be displayed in the selector. 1662 */ 1663 private void incrementSelectorIndices(int[] selectorIndices) { 1664 for (int i = 0; i < selectorIndices.length - 1; i++) { 1665 selectorIndices[i] = selectorIndices[i + 1]; 1666 } 1667 int nextScrollSelectorIndex = selectorIndices[selectorIndices.length - 2] + 1; 1668 if (mWrapSelectorWheel && nextScrollSelectorIndex > mMaxValue) { 1669 nextScrollSelectorIndex = mMinValue; 1670 } 1671 selectorIndices[selectorIndices.length - 1] = nextScrollSelectorIndex; 1672 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1673 } 1674 1675 /** 1676 * Decrements the <code>selectorIndices</code> whose string representations 1677 * will be displayed in the selector. 1678 */ 1679 private void decrementSelectorIndices(int[] selectorIndices) { 1680 for (int i = selectorIndices.length - 1; i > 0; i--) { 1681 selectorIndices[i] = selectorIndices[i - 1]; 1682 } 1683 int nextScrollSelectorIndex = selectorIndices[1] - 1; 1684 if (mWrapSelectorWheel && nextScrollSelectorIndex < mMinValue) { 1685 nextScrollSelectorIndex = mMaxValue; 1686 } 1687 selectorIndices[0] = nextScrollSelectorIndex; 1688 ensureCachedScrollSelectorValue(nextScrollSelectorIndex); 1689 } 1690 1691 /** 1692 * Ensures we have a cached string representation of the given <code> 1693 * selectorIndex</code> 1694 * to avoid multiple instantiations of the same string. 1695 */ 1696 private void ensureCachedScrollSelectorValue(int selectorIndex) { 1697 SparseArray<String> cache = mSelectorIndexToStringCache; 1698 String scrollSelectorValue = cache.get(selectorIndex); 1699 if (scrollSelectorValue != null) { 1700 return; 1701 } 1702 if (selectorIndex < mMinValue || selectorIndex > mMaxValue) { 1703 scrollSelectorValue = ""; 1704 } else { 1705 if (mDisplayedValues != null) { 1706 int displayedValueIndex = selectorIndex - mMinValue; 1707 scrollSelectorValue = mDisplayedValues[displayedValueIndex]; 1708 } else { 1709 scrollSelectorValue = formatNumber(selectorIndex); 1710 } 1711 } 1712 cache.put(selectorIndex, scrollSelectorValue); 1713 } 1714 1715 private String formatNumber(int value) { 1716 return (mFormatter != null) ? mFormatter.format(value) : String.valueOf(value); 1717 } 1718 1719 private void validateInputTextView(View v) { 1720 String str = String.valueOf(((TextView) v).getText()); 1721 if (TextUtils.isEmpty(str)) { 1722 // Restore to the old value as we don't allow empty values 1723 updateInputTextView(); 1724 } else { 1725 // Check the new value and ensure it's in range 1726 int current = getSelectedPos(str.toString()); 1727 changeCurrent(current); 1728 } 1729 } 1730 1731 /** 1732 * Updates the view of this NumberPicker. If displayValues were specified in 1733 * the string corresponding to the index specified by the current value will 1734 * be returned. Otherwise, the formatter specified in {@link #setFormatter} 1735 * will be used to format the number. 1736 */ 1737 private void updateInputTextView() { 1738 /* 1739 * If we don't have displayed values then use the current number else 1740 * find the correct value in the displayed values for the current 1741 * number. 1742 */ 1743 if (mDisplayedValues == null) { 1744 mInputText.setText(formatNumber(mValue)); 1745 } else { 1746 mInputText.setText(mDisplayedValues[mValue - mMinValue]); 1747 } 1748 mInputText.setSelection(mInputText.getText().length()); 1749 1750 if (mFlingable && AccessibilityManager.getInstance(mContext).isEnabled()) { 1751 String text = mContext.getString(R.string.number_picker_increment_scroll_mode, 1752 mInputText.getText()); 1753 mInputText.setContentDescription(text); 1754 } 1755 } 1756 1757 /** 1758 * Notifies the listener, if registered, of a change of the value of this 1759 * NumberPicker. 1760 */ 1761 private void notifyChange(int previous, int current) { 1762 if (mOnValueChangeListener != null) { 1763 mOnValueChangeListener.onValueChange(this, previous, mValue); 1764 } 1765 } 1766 1767 /** 1768 * Posts a command for changing the current value by one. 1769 * 1770 * @param increment Whether to increment or decrement the value. 1771 */ 1772 private void postChangeCurrentByOneFromLongPress(boolean increment) { 1773 mInputText.clearFocus(); 1774 removeAllCallbacks(); 1775 if (mChangeCurrentByOneFromLongPressCommand == null) { 1776 mChangeCurrentByOneFromLongPressCommand = new ChangeCurrentByOneFromLongPressCommand(); 1777 } 1778 mChangeCurrentByOneFromLongPressCommand.setIncrement(increment); 1779 post(mChangeCurrentByOneFromLongPressCommand); 1780 } 1781 1782 /** 1783 * Removes all pending callback from the message queue. 1784 */ 1785 private void removeAllCallbacks() { 1786 if (mChangeCurrentByOneFromLongPressCommand != null) { 1787 removeCallbacks(mChangeCurrentByOneFromLongPressCommand); 1788 } 1789 if (mAdjustScrollerCommand != null) { 1790 removeCallbacks(mAdjustScrollerCommand); 1791 } 1792 if (mSetSelectionCommand != null) { 1793 removeCallbacks(mSetSelectionCommand); 1794 } 1795 } 1796 1797 /** 1798 * @return The selected index given its displayed <code>value</code>. 1799 */ 1800 private int getSelectedPos(String value) { 1801 if (mDisplayedValues == null) { 1802 try { 1803 return Integer.parseInt(value); 1804 } catch (NumberFormatException e) { 1805 // Ignore as if it's not a number we don't care 1806 } 1807 } else { 1808 for (int i = 0; i < mDisplayedValues.length; i++) { 1809 // Don't force the user to type in jan when ja will do 1810 value = value.toLowerCase(); 1811 if (mDisplayedValues[i].toLowerCase().startsWith(value)) { 1812 return mMinValue + i; 1813 } 1814 } 1815 1816 /* 1817 * The user might have typed in a number into the month field i.e. 1818 * 10 instead of OCT so support that too. 1819 */ 1820 try { 1821 return Integer.parseInt(value); 1822 } catch (NumberFormatException e) { 1823 1824 // Ignore as if it's not a number we don't care 1825 } 1826 } 1827 return mMinValue; 1828 } 1829 1830 /** 1831 * Posts an {@link SetSelectionCommand} from the given <code>selectionStart 1832 * </code> to 1833 * <code>selectionEnd</code>. 1834 */ 1835 private void postSetSelectionCommand(int selectionStart, int selectionEnd) { 1836 if (mSetSelectionCommand == null) { 1837 mSetSelectionCommand = new SetSelectionCommand(); 1838 } else { 1839 removeCallbacks(mSetSelectionCommand); 1840 } 1841 mSetSelectionCommand.mSelectionStart = selectionStart; 1842 mSetSelectionCommand.mSelectionEnd = selectionEnd; 1843 post(mSetSelectionCommand); 1844 } 1845 1846 /** 1847 * Posts an {@link AdjustScrollerCommand} within the given <code> 1848 * delayMillis</code> 1849 * . 1850 */ 1851 private void postAdjustScrollerCommand(int delayMillis) { 1852 if (mAdjustScrollerCommand == null) { 1853 mAdjustScrollerCommand = new AdjustScrollerCommand(); 1854 } else { 1855 removeCallbacks(mAdjustScrollerCommand); 1856 } 1857 postDelayed(mAdjustScrollerCommand, delayMillis); 1858 } 1859 1860 /** 1861 * Filter for accepting only valid indices or prefixes of the string 1862 * representation of valid indices. 1863 */ 1864 class InputTextFilter extends NumberKeyListener { 1865 1866 // XXX This doesn't allow for range limits when controlled by a 1867 // soft input method! 1868 public int getInputType() { 1869 return InputType.TYPE_CLASS_TEXT; 1870 } 1871 1872 @Override 1873 protected char[] getAcceptedChars() { 1874 return DIGIT_CHARACTERS; 1875 } 1876 1877 @Override 1878 public CharSequence filter(CharSequence source, int start, int end, Spanned dest, 1879 int dstart, int dend) { 1880 if (mDisplayedValues == null) { 1881 CharSequence filtered = super.filter(source, start, end, dest, dstart, dend); 1882 if (filtered == null) { 1883 filtered = source.subSequence(start, end); 1884 } 1885 1886 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1887 + dest.subSequence(dend, dest.length()); 1888 1889 if ("".equals(result)) { 1890 return result; 1891 } 1892 int val = getSelectedPos(result); 1893 1894 /* 1895 * Ensure the user can't type in a value greater than the max 1896 * allowed. We have to allow less than min as the user might 1897 * want to delete some numbers and then type a new number. 1898 */ 1899 if (val > mMaxValue) { 1900 return ""; 1901 } else { 1902 return filtered; 1903 } 1904 } else { 1905 CharSequence filtered = String.valueOf(source.subSequence(start, end)); 1906 if (TextUtils.isEmpty(filtered)) { 1907 return ""; 1908 } 1909 String result = String.valueOf(dest.subSequence(0, dstart)) + filtered 1910 + dest.subSequence(dend, dest.length()); 1911 String str = String.valueOf(result).toLowerCase(); 1912 for (String val : mDisplayedValues) { 1913 String valLowerCase = val.toLowerCase(); 1914 if (valLowerCase.startsWith(str)) { 1915 postSetSelectionCommand(result.length(), val.length()); 1916 return val.subSequence(dstart, val.length()); 1917 } 1918 } 1919 return ""; 1920 } 1921 } 1922 } 1923 1924 /** 1925 * Command for setting the input text selection. 1926 */ 1927 class SetSelectionCommand implements Runnable { 1928 private int mSelectionStart; 1929 1930 private int mSelectionEnd; 1931 1932 public void run() { 1933 mInputText.setSelection(mSelectionStart, mSelectionEnd); 1934 } 1935 } 1936 1937 /** 1938 * Command for adjusting the scroller to show in its center the closest of 1939 * the displayed items. 1940 */ 1941 class AdjustScrollerCommand implements Runnable { 1942 public void run() { 1943 mPreviousScrollerY = 0; 1944 if (mInitialScrollOffset == mCurrentScrollOffset) { 1945 updateInputTextView(); 1946 showInputControls(mShowInputControlsAnimimationDuration); 1947 return; 1948 } 1949 // adjust to the closest value 1950 int deltaY = mInitialScrollOffset - mCurrentScrollOffset; 1951 if (Math.abs(deltaY) > mSelectorElementHeight / 2) { 1952 deltaY += (deltaY > 0) ? -mSelectorElementHeight : mSelectorElementHeight; 1953 } 1954 mAdjustScroller.startScroll(0, 0, 0, deltaY, SELECTOR_ADJUSTMENT_DURATION_MILLIS); 1955 invalidate(); 1956 } 1957 } 1958 1959 /** 1960 * Command for changing the current value from a long press by one. 1961 */ 1962 class ChangeCurrentByOneFromLongPressCommand implements Runnable { 1963 private boolean mIncrement; 1964 1965 private void setIncrement(boolean increment) { 1966 mIncrement = increment; 1967 } 1968 1969 public void run() { 1970 changeCurrentByOne(mIncrement); 1971 postDelayed(this, mLongPressUpdateInterval); 1972 } 1973 } 1974} 1975